Legalizing drugs is not something I'd be happy to see. The consequences of making it legal to shoot up or whatever could be severe. However, I'm not sure that keeping drugs illegal doesn't have more severe consequences for society than the ban.
To an extent it's not much different than the corruption that prohibition helped foster in the US during the 1920s. Only, with drugs most of the raw material is in poor countries where drug kingpins completely hold sway. And, in Afghanistan the illegal drug trade is feeding instability and helping fund the Taliban.
Again, I'm not sure. I guess you could say I'm open to the discussion.